JPH05106457A - Supercharger device - Google Patents

Abstract

PURPOSE:To eliminate troubles due to assembly as well as to make a device light in weight for forming a housing out of light metal such as aluminum or an Al-based alloy material, and concurrently interposing a collar made of iron or an iron-based alloy material between a housing hole and a roller bearing. CONSTITUTION:A supercharger 1 supports an input shaft 2 driven by an internal combustion engine onto a housing 3 made of an Al-based alloy material by a roller bearing 4. The input shaft 2 is formed integrally with the internal gear 6 of an accelerating gear 5 so as to be housed in the housing 3. An impeller shaft 13 is supported by a roller bearing 16 between an impeller 12 and the accelerating gear 5. An outer race 18 is coupled in a collar 43 coupled in the housing hole 19 of a boss 11, with a play while a specified gap C is maintained. The collar 43 made of iron or an iron-based alloy material is formed into a cylindrical shape, so that it is shrunk into the housing hole 19 of the boss 11 made of an Al-based alloy material at 150 deg.C, or it is pressed in the hole with pressure so as to be assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical drive type supercharger device having an impeller shaft with an impeller.

[0002]

2. Description of the Related Art As a supercharging system for improving the output of an internal combustion engine, there are an exhaust turbo type and a mechanical drive type, and the present invention belongs to the latter. As a conventional example of the latter mechanical drive type supercharger, there is one disclosed in Japanese Patent Publication No. 3-500317. It has an impeller shaft with an impeller that is driven by an internal combustion engine via an input shaft and a speed-up gear, and the impeller shaft is a rolling bearing that fits in a housing hole with a radial gap. It is supported.

With the conventional structure, since the oil film filled in the gap absorbs the vibration by the above structure, the impeller can rotate at a high speed, thereby supercharging the intake air and improving the output of the internal combustion engine. It is a thing.

[0004]

By the way, when assembling the supercharger, no problem occurs when the housing is made of the same ferrous metal as the bearing. However, aluminum is used to reduce the weight of the housing in order to improve vehicle performance. If it is made of a light metal material such as an alloy, the following problem of assembly failure occurs.

That is, the vibration absorbing gap needs to have a proper gap (0.2 to 0.3 mm) at a temperature of about 80 to 100 ° C. when the temperature rises during operation. In order to secure the bearing, considering the large expansion of aluminum etc., at the time of assembly at room temperature, the bearing is fitted into the aluminum housing with almost zero or a minus clearance, that is, by shrink fit or axial compression. You must take measures for tight gaps, so-called press-fitting, where force is applied. Since the bearing is preassembled as a so-called bearing unit by previously assembling a set of a long impeller shaft with an impeller and a sun gear as one set, the shrink fitting or press-fitting causes a problem such as bending of the long thin shaft. Therefore, there is a problem in that it is difficult to assemble because of this.

Therefore, according to the present invention, even if the housing of the supercharger is made of an alloy such as aluminum, the problem of assembling failure does not occur and the gap for absorbing the vibration of the impeller shaft during operation can be properly maintained. It is an object of the present invention to provide a charger device and thus solve the above-mentioned problems.

[0007]

In order to achieve the above object, the present invention has an impeller shaft with an impeller driven by an internal combustion engine via an input shaft and a speed increasing gear, and the impeller shaft is housed in a housing. In a supercharger supported by a rolling bearing fitted in a hole with a radial gap, the housing is made of a light metal material such as aluminum or aluminum alloy, and the housing hole and the rolling bearing are In addition, a collar made of iron or an iron-based alloy material is interposed.

[0008]

It is possible to easily shrink-fit or press-fit the collar into the housing accommodating hole because this is a simple cylindrical body having no elongated impeller shaft or the like. Also, since the collar is made of iron-based material, the same clearance as at the time of expansion is sufficient even at room temperature. Therefore, the set bearing unit with impeller is lightly inserted into the collar fitted in the housing. It is inserted and assembled. At high temperatures, the gap between the collar and the housing receiving hole hardly occurs due to shrink-fitting or press-fitting, so that the vibration is absorbed exclusively by the damper gap between the bearing and the collar.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. First, the configuration will be described. In FIG. 1, a supercharger 1 is configured to support an input shaft 2 driven by an internal combustion engine (not shown) on the left side of the drawing in a housing 3 made of an aluminum alloy material by a rolling bearing 4. The input shaft 2 is integrated with the internal gear 6 of the speed increasing gear 5,
It is housed in the housing 3. The speed increasing gear 5 includes a pinion gear 7 that meshes with the internal gear 6 and a sun gear 8 as an output shaft that meshes with the pinion gear 7.

The pinion gear 7 is rotatably supported by a rolling bearing 9 around a shaft 10 on a conical boss 11 made of an aluminum alloy material which is integrally fitted in the inner hole 15 of the housing 3.

The sun gear 8 is formed integrally with an impeller shaft 13 to which an impeller 12 located on the right side in the drawing is fastened with a nut 14. The impeller shaft 13 is a rolling bearing (angular ball bearing) between the impeller 12 and the speed increasing gear 5.
Supported by 16. The rolling bearing 16 is composed of an inner race 17 and an outer race 18 which are composed of a combination of substantially symmetrical bearing pieces.
The outer race 18 has the ball 16a between the boss 1 and
1 has a predetermined clearance (about 0.1 mm at normal temperature) C in the collar 43 fitted in the accommodation hole 19 and is loosened at the top notch by the plates 20 and 21 and the bolt 22. ing.

The impeller 12 is housed in a shroud 25 having an inlet 23 and a scroll outlet 24, and the shroud 25 is bolted integrally with the housing 3. The oil is supplied from the supply port 26 attached to the housing 3 and taken out from the lower return port 27 through the return passage 27a. The supplied oil passes through the groove 28, the clearance C, and the lubricating hole 30 of the rolling bearing 16 to lubricate the rotary sliding portion.

A mechanical seal 32 is provided in an inner hole of a spacer 31 which is an integral extension of the outer race 18 to the right. The mechanical seal 32 is in contact with the right end of the inner race 17 by a mating ring 44, and the spacer 41 is opposed to the impeller 12. Abuts on.

The rolling bearing 16, the impeller shaft 13 integrated with the sun gear 8, the mating ring 44, the mechanical seal 32, the spacer 41, the impeller 12, and the nut 14
Are sequentially assembled into one set to form a bearing unit 40 as a sub-assembly (see FIG. 2).

As shown in FIG. 3, the collar 43 has an outer diameter D of about 50 mm and a radial thickness T of 2 to 5 mm, and is close to a steel material as a constituent material of the rolling bearing 16, such as mild steel.
It has the shape of a cylinder made of iron-based material such as carburized steel or its alloy material, and is shrink-fitted at 150 ° C. or press-fitted into the receiving hole 19 of the boss 11 made of aluminum alloy to be assembled.

The boss 11 to which the collar 43 is attached
That is, the bearing unit 40 is provided in the inner hole 43a of the collar 43.
Is inserted at room temperature with a gap C of 0.1 mm as described above. This insertion is facilitated by the presence of the gap C.

Next, the operation of the above embodiment will be described. When the output shaft 2 is driven by an internal combustion engine (not shown), the speed is increased by the speed increasing gear 5, and the output shaft, that is, the sun gear 8 rotates at high speed. As a result, the impeller shaft 13, which is integral with the sun gear 8,
The impeller 12 rotates at high speed, sucks air from the suction port 23, compresses it, discharges it from the scroll outlet 24, and sends it to the internal combustion engine for supercharging.

At this time, oil is sent from the supply port 26,
It reaches the groove 28 of the outer race 18 of the rolling bearing 16, passes through the clearance C, flows from the lubricating hole 30 to the rotary sliding portion such as the ball 16a, lubricates it, and returns through the return passage 27a and the return port 27.

When the temperature rises to, for example, 100 ° C. during the operation of the supercharger 1, the aluminum boss 11 expands greatly, and the iron collar 43 and the rolling bearing 16 expand less. In this case, collar 43 and boss 1
Since the clearance between the first housing hole 19 and the first housing hole 19 is shrink-fitted or press-fitted at room temperature, it hardly occurs even at high temperature. However, since the clearance C between the collar 43 and the outer race 18 of the rolling bearing 16 is 0.1 mm at room temperature, it increases to 0.2 to 0.3 mm when the temperature of the housing rises.
For this reason, the oil enters the gap C from the groove 28 and fills it in an annular shape. This makes the impeller 1
The vibration of the bearing unit 40 based on 2 at high speed is absorbed, and an appropriate damper action by the oil film is obtained.

Since the gap C of the damper action at the time of high temperature operation is a relation between iron at the time of assembly at room temperature, the bearing unit 40 is bossed with a loose gap of 0.1 mm. Since it is assembled only by inserting it in the collar 43 in 11, the problem that the impeller shaft 13 bends unlike the conventional case does not occur. In addition, prior to that, the boss 11 of the collar 43 is fitted into the accommodation hole 19,
This is done by shrink fitting or press fitting due to the temperature rise of the part (150 ° C), but since the collar 43 is simply a cylindrical body (see Fig. 3), there is almost no deformation at the time of shrink fitting or press fitting, and the fitting is defective. Can be done easily without.

[0021]

As described above, according to the present invention, an oil film can be formed and an appropriate damper action can be maintained without causing a problem such as bending of the impeller shaft during assembly. There is an effect that the weight of the charger can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a front view of the bearing unit shown in FIG.

FIG. 3 is a perspective view of a collar which is a main part of FIG.

[Explanation of symbols]

 1 Supercharger 2 Input shaft 3 Housing 5 Speed increasing gear 6 Internal gear 7 Pinion gear 8 Sun gear (Output shaft) 11 Boss 12 Impeller 13 Impeller shaft 15 Inner hole 16 Rolling bearing 17 Inner race 18 Outer race 19 Storage hole 28 Groove 30 Lubrication hole 40 Bearing unit 43 Color C Gap

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location F04D 29/60 H 7314-3H F16C 35/077 6814-3J

Claims (1)

[Claims] 1. A rolling bearing having an impeller shaft with an impeller driven by an internal combustion engine via an input shaft and a speed increasing gear, the impeller shaft being fitted in a housing hole of a housing with a radial gap. In the supercharger supported by, the housing is made of a light metal material such as aluminum or an aluminum alloy, and a collar made of iron or an iron-based alloy material is interposed between the housing hole and the bearing. Supercharger device characterized by.